<template>
  <div class="timer">
    <div ref="startTimer"></div>
  </div>
</template>
    <script>
export default {
  name: "Timer",
  data() {
    return {
      timer: "",
      content: "",
      hour: 0,
      minutes: 0,
      seconds: 0
    };
  },
  created() {
    this.timer = setInterval(this.startTimer, 1000);
  },
  destroyed() {
    clearInterval(this.timer);
  },

  methods: {
    startTimer() {
      this.seconds += 1;
      if (this.seconds >= 60) {
        this.seconds = 0;
        this.minute = this.minute + 1;
      }

      if (this.minute >= 60) {
        this.minute = 0;
        this.hour = this.hour + 1;
      }
      this.$refs.startTimer.innerHTML =
        (this.minutes < 10 ? "0" + this.minutes : this.minutes) +
        ":" +
        (this.seconds < 10 ? "0" + this.seconds : this.seconds);
    }
  }
};
</script>
    <style>
</style>